Diamond grinder



E.' mis. "DIAMOND GRINDER. v APPLICATION FILED APR. I8. i918. RENEWED OCT. 15,192l- INVENTOR' ATTORNEY -FERDTNAND ETES, OF NEW YORK, N. rc.

Figi,

DIAMGND GRI-NBER.

Specification of Letters Eatent.

Patented May 9, 1922.

Application filed April 1S, 1918, Serial Noi 229,218. Renewed October 15, 1921, Serial No. 508,051.

This invention deals with mechanism for cutting and polishingprecious stones, such as diamonds, and it proposes a simple, compact, inexpensive and convenient apparatus i'or this purpose. I

lernt-:riore devi-:fes 'for successfully polishing stones have been commercially available, but said devices hv ve been oi restricted capacity because oit various mechanical infronveniencesthe necessity: oi releasing the gem :in order to reposition it for different facetsA and have been inconvenient to use'.

Tn order that the present invention may be moreV clearly understood and carried-into eiiect, the same is Vhereinaiter disclosed by way oi an' improved? embodiment thereof shown in the accompanying drawings, in which 1- g 1 is a left-handed side elevation oi t e dop-holder. Fig. 2 is a rear elevation thereof. Fig. 3 is a section on the line TH- HT of Fig. 2. Fig. 4; is a righthanded side elevation the dop-holder. Fig. 5 is a section on the line J V of Fig. 1; and F ig. 6 is a perspective of the intermediate angling block.

The present construction comprises elements for angularly positioning the gem, the dop-holder illustrated providing micrometer angular adjustment-s `in all of the primary directions, i. e., in all oi' the geometrical. planes necessary for the accurate grinding oit the facets of a diamond. holder comprises a stem 159 in the nature of a hase adapted to be affixed to a suitable adjustahlepart for changing the elevation of the gem. Preferably, this attachment is readily separable and to that end an ein' tension 117 having a bifurcation 118 which receives the shank 158 of the dop-holder. The knurled nut 160 is screw-threaded to an.

extension 187 so that the dop holder may be with relation to extension 117. The lower This dop-l part of the stern 159 is biiurcated 'to provide the side-wings 181, and locked therebetween is the block 170 shown by Fig. 6; said block being pivoted to swing through any desired vertical angl-e. This is accomplished by a pivotpin 162 which passes through a hole 171 and is rigidly secured to the block by means ot a key-pin 185 entering the hole 176 in the pivot-pin. A nut 183 is secured at one end of the pivot pin-and the other end has a head to which is rigidly' 'fastened a dial hand 1041 cooperating with the gradua tions 165 on the side ot the corresponding wing 161Y By these means the angular relationoit the block 170 to the stein 159'is indicated, and a micrometer screw 190 is-provided 'for the purpose of accurate adjustments. This micrometer screw consists of a screw proper 186 cooperating with the worm..171 cut in the block 170; said screvv 186 being journaled between the side-pieces 188 and the stem 159 by means oi the bearings 187. 'A pin 189 secures a collar 1.90 to the serewanda part 192 affords a grip on said collar.

scratch-mark on `the side-piece 188. vThis constitutes a micrometer adjustment since each ot the divisions 191 may represent a degree or fraction oi a degree.. as may be desired., and as a consequence, a very accurate angling of the piece 170 is available.

Tn order to obtain an adjustment through a vertical angle in a plane at right-angles to that above mentioned.` the block 170 has a hole 172 at right-angles to the hole 171 and a pin 184.- passes through a drill hole 175 andl keys the pivot-pin 178 to the block 170. A dop-support 201 provides sidewings which are pivoted to the pivot-pin 17 8, and a nut 180 is secured to one end of the pin 178 and a pointer 179 is secured to the other end. This pointer cooperates with graduations 181 on the support 201. Within the support is journaled a micrometer crew 1911 meshingwith the worm 173 cut in the block 17 0. The worm has end-bearings 195 which ride respectively in the socket 202 and the collar 196 affixed to the support 201. The graduated-collar 198 is pinned at 197 to the bearing 195 and has a part 199 to facilitater its turning. This collar 198 is provided with graduations 200 which cooperate with a suitable scratch-mark on the support 201. By these means, a micrometer adjustment in a vertical plane at right- The collar is provided .with graduations 191 cooperating with a suitable scratch-mark on the part 20,1 to enable it to be set in any desired horizontal angle in the same. The gem is seated in a socket 212 in the extremity of a dop 210 and this dop is held in a tapered socket 220 by means of a screw 209entering a screw-threaded aperture 211; said screw having,- a knurledupper end ,208.

2U The gem is held in its seat by a number of prongs 217 which have their extremities 218 cut at angles corresponding` to the facets of the stone so as to grip it and yet expose a very substantial portion of the stone for cutting purposes. The Shanks vof the prongs 217 are received by sockets 216 in the dop holder and screws V219 serve to clamp them firmly in place. TheseA prongs 21'? yare interchangeable and in the process y of exposing a new facet they are shifted step by step throughout the different s0ckets 216 in such a manner that the stone vis always held rigidly grasped by a plu# rality of prongs. j The claims of this application are direeted to the dop holder per se, and the novel features of construction ofl the bridge, carriage, and related elements will be rnade the subject matten of applications constituting divisions of this case.

Having thus revealed this invention, l claim new andl desire to secure the followinfn)` combinations of steps and elements, or equivalents thereof, by Letters latent of the United States I claim;

1. A unitary dop holder combining an intermediate block having` two worms in5 transverse planes; a base piece having` a micrometer screw engaging one of said worms; and a dop holder having a mierometer screw engaging the other worm, whereby a micrometer adjustment in two transverse planes is provided.v Y

2. A unitary dop holder combining)` a base piece adapted to be securedA to a carriage;

a gem holder;v a block intermediate said parts and pivoted atright anglesto each; l a micrometer adjusting` screw for determiir ing the angular relation between said sec-. ndementioned part and said intermediate block. 'f y In witness whereof, I' hereunto subscribe myfname, as attested lby the two subscribing witnesses.

FERDNAND KIES.. Witnesses: j v Y f LEON MINTZ, ALBERT F. NATHAN. 

